Power amplifier for the range of 2 meters. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / RF power amplifiers
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The amplifier is designed to work with a 2-meter transceiver. The output power depends on the output transistor: KT 904 - 4 to 5W, KT 907 - 7 to 8W, 2N3375 - 7 to 10W, 2N3632 - 8 to 12W.
(click to enlarge)
The transition from reception to transmission is carried out by a VOX switch made on transistors VT2 / VT3 (KT315). Capacitor C1 - 0,5-2,2 pF, sets reliable operation of relay K1.
Chokes L6 - L8 are made with 0,4 mm wire, L6 / L7 - 6 turns, L8 - 100 turns. High-frequency coils are wound with silver-plated wire 0,8 mm: Ll - 2 turns, frame - 8 mm, winding length 11 mm; L2 / L3 - 4 turns, frame - 6,8 mm, winding length 10 mm; L4 / L5 - 5 turns, frame - 5,2 mm, winding length 12 mm.
The output impedance of the cascade is 75 ohms. Capacitor C4 contains 33 to 180 pF.
Literature
- Elektronisches Jarbuch 1989, pp.190-191.
Publication: N. Bolshakov, rf.atnn.ru
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